зеркало из https://github.com/mozilla/pjs.git
261 строка
9.3 KiB
C
261 строка
9.3 KiB
C
/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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*
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* The contents of this file are subject to the Netscape Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is Mozilla Communicator client code, released
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* March 31, 1998.
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*
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* The Initial Developer of the Original Code is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the
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* terms of the GNU Public License (the "GPL"), in which case the
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* provisions of the GPL are applicable instead of those above.
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* If you wish to allow use of your version of this file only
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* under the terms of the GPL and not to allow others to use your
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* version of this file under the NPL, indicate your decision by
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* deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL. If you do not delete
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* the provisions above, a recipient may use your version of this
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* file under either the NPL or the GPL.
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*/
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#ifndef jsnum_h___
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#define jsnum_h___
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/*
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* JS number (IEEE double) interface.
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*
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* JS numbers are optimistically stored in the top 31 bits of 32-bit integers,
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* but floating point literals, results that overflow 31 bits, and division and
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* modulus operands and results require a 64-bit IEEE double. These are GC'ed
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* and pointed to by 32-bit jsvals on the stack and in object properties.
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*
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* When a JS number is treated as an object (followed by . or []), the runtime
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* wraps it with a JSObject whose valueOf method returns the unwrapped number.
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*/
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JS_BEGIN_EXTERN_C
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/*
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* Stefan Hanske <sh990154@mail.uni-greifswald.de> reports:
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* ARM is a little endian architecture but 64 bit double words are stored
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* differently: the 32 bit words are in little endian byte order, the two words
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* are stored in big endian`s way.
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*/
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#if defined(__arm) || defined(__arm32__) || defined(__arm26__) || defined(__arm__)
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#define CPU_IS_ARM
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#endif
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#if (__GNUC__ == 2 && __GNUC_MINOR__ > 95) || __GNUC__ > 2
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/*
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* This version of the macros is safe for the alias optimizations that gcc
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* does, but uses gcc-specific extensions.
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*/
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typedef union {
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jsdouble value;
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struct {
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#if defined(IS_LITTLE_ENDIAN) && !defined(CPU_IS_ARM)
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uint32 lsw;
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uint32 msw;
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#else
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uint32 msw;
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uint32 lsw;
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#endif
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} parts;
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} js_ieee_double_shape_type;
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#define JSDOUBLE_HI32(x) (__extension__ ({ js_ieee_double_shape_type sh_u; \
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sh_u.value = (x); \
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sh_u.parts.msw; }))
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#define JSDOUBLE_LO32(x) (__extension__ ({ js_ieee_double_shape_type sh_u; \
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sh_u.value = (x); \
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sh_u.parts.lsw; }))
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#define JSDOUBLE_SET_HI32(x, y) (__extension__ ({ \
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js_ieee_double_shape_type sh_u; \
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sh_u.value = (x); \
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sh_u.parts.msw = (y); \
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(x) = sh_u.value; }))
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#define JSDOUBLE_SET_LO32(x, y) (__extension__ ({ \
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js_ieee_double_shape_type sh_u; \
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sh_u.value = (x); \
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sh_u.parts.lsw = (y); \
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(x) = sh_u.value; }))
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#else /* GNUC */
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/*
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* We don't know of any non-gcc compilers that perform alias optimization,
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* so this code should work.
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*/
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#if defined(IS_LITTLE_ENDIAN) && !defined(CPU_IS_ARM)
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#define JSDOUBLE_HI32(x) (((uint32 *)&(x))[1])
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#define JSDOUBLE_LO32(x) (((uint32 *)&(x))[0])
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#else
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#define JSDOUBLE_HI32(x) (((uint32 *)&(x))[0])
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#define JSDOUBLE_LO32(x) (((uint32 *)&(x))[1])
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#endif
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#define JSDOUBLE_SET_HI32(x, y) (JSDOUBLE_HI32(x)=(y))
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#define JSDOUBLE_SET_LO32(x, y) (JSDOUBLE_LO32(x)=(y))
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#endif /* GNUC */
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#define JSDOUBLE_HI32_SIGNBIT 0x80000000
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#define JSDOUBLE_HI32_EXPMASK 0x7ff00000
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#define JSDOUBLE_HI32_MANTMASK 0x000fffff
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#define JSDOUBLE_IS_NaN(x) \
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((JSDOUBLE_HI32(x) & JSDOUBLE_HI32_EXPMASK) == JSDOUBLE_HI32_EXPMASK && \
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(JSDOUBLE_LO32(x) || (JSDOUBLE_HI32(x) & JSDOUBLE_HI32_MANTMASK)))
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#define JSDOUBLE_IS_INFINITE(x) \
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((JSDOUBLE_HI32(x) & ~JSDOUBLE_HI32_SIGNBIT) == JSDOUBLE_HI32_EXPMASK && \
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!JSDOUBLE_LO32(x))
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#define JSDOUBLE_IS_FINITE(x) \
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((JSDOUBLE_HI32(x) & JSDOUBLE_HI32_EXPMASK) != JSDOUBLE_HI32_EXPMASK)
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#define JSDOUBLE_IS_NEGZERO(d) (JSDOUBLE_HI32(d) == JSDOUBLE_HI32_SIGNBIT && \
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JSDOUBLE_LO32(d) == 0)
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/*
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* JSDOUBLE_IS_INT first checks that d is neither NaN nor infinite, to avoid
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* raising SIGFPE on platforms such as Alpha Linux, then (only if the cast is
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* safe) leaves i as (jsint)d. This also avoid anomalous NaN floating point
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* comparisons under MSVC.
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*/
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#define JSDOUBLE_IS_INT(d, i) (JSDOUBLE_IS_FINITE(d) \
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&& !JSDOUBLE_IS_NEGZERO(d) \
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&& ((d) == (i = (jsint)(d))))
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/* Initialize number constants and runtime state for the first context. */
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extern JSBool
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js_InitRuntimeNumberState(JSContext *cx);
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extern void
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js_FinishRuntimeNumberState(JSContext *cx);
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/* Initialize the Number class, returning its prototype object. */
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extern JSObject *
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js_InitNumberClass(JSContext *cx, JSObject *obj);
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/*
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* String constants for global function names, used in jsapi.c and jsnum.c.
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*/
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extern const char js_Infinity_str[];
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extern const char js_NaN_str[];
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extern const char js_isNaN_str[];
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extern const char js_isFinite_str[];
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extern const char js_parseFloat_str[];
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extern const char js_parseInt_str[];
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/* GC-allocate a new JS number. */
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extern jsdouble *
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js_NewDouble(JSContext *cx, jsdouble d);
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extern void
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js_FinalizeDouble(JSContext *cx, jsdouble *dp);
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extern JSBool
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js_NewDoubleValue(JSContext *cx, jsdouble d, jsval *rval);
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extern JSBool
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js_NewNumberValue(JSContext *cx, jsdouble d, jsval *rval);
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/* Construct a Number instance that wraps around d. */
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extern JSObject *
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js_NumberToObject(JSContext *cx, jsdouble d);
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/* Convert a number to a GC'ed string. */
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extern JSString *
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js_NumberToString(JSContext *cx, jsdouble d);
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/*
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* Convert a value to a number, returning false after reporting any error,
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* otherwise returning true with *dp set.
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*/
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extern JSBool
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js_ValueToNumber(JSContext *cx, jsval v, jsdouble *dp);
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/*
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* Convert a value or a double to an int32, according to the ECMA rules
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* for ToInt32.
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*/
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extern JSBool
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js_ValueToECMAInt32(JSContext *cx, jsval v, int32 *ip);
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extern JSBool
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js_DoubleToECMAInt32(JSContext *cx, jsdouble d, int32 *ip);
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/*
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* Convert a value or a double to a uint32, according to the ECMA rules
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* for ToUint32.
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*/
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extern JSBool
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js_ValueToECMAUint32(JSContext *cx, jsval v, uint32 *ip);
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extern JSBool
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js_DoubleToECMAUint32(JSContext *cx, jsdouble d, uint32 *ip);
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/*
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* Convert a value to a number, then to an int32 if it fits by rounding to
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* nearest; but failing with an error report if the double is out of range
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* or unordered.
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*/
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extern JSBool
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js_ValueToInt32(JSContext *cx, jsval v, int32 *ip);
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/*
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* Convert a value to a number, then to a uint16 according to the ECMA rules
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* for ToUint16.
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*/
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extern JSBool
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js_ValueToUint16(JSContext *cx, jsval v, uint16 *ip);
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/*
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* Convert a jsdouble to an integral number, stored in a jsdouble.
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* If d is NaN, return 0. If d is an infinity, return it without conversion.
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*/
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extern jsdouble
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js_DoubleToInteger(jsdouble d);
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/*
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* Similar to strtod except that replaces overflows with infinities of the correct
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* sign and underflows with zeros of the correct sign. Guaranteed to return the
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* closest double number to the given input in dp.
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* Also allows inputs of the form [+|-]Infinity, which produce an infinity of the
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* appropriate sign. The case of the "Infinity" string must match.
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* If the string does not have a number in it, set *ep to s and return 0.0 in dp.
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* Return false if out of memory.
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*/
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extern JSBool
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js_strtod(JSContext *cx, const jschar *s, const jschar **ep, jsdouble *dp);
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/*
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* Similar to strtol except that handles integers of arbitrary size. Guaranteed to
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* return the closest double number to the given input when radix is 10 or a power of 2.
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* May experience roundoff errors for very large numbers of a different radix.
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* If the string does not have a number in it, set *ep to s and return 0.0 in dp.
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* Return false if out of memory.
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*/
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extern JSBool
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js_strtointeger(JSContext *cx, const jschar *s, const jschar **ep, jsint radix, jsdouble *dp);
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JS_END_EXTERN_C
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#endif /* jsnum_h___ */
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